Supposedly crockett "detuned" them for pump gas. Basically, slapped some flat top pistons in there and sent them on their way from what the teardowns looked like.

You got me there !

What was the correction factor on those 500hp 502s you built that blew up?

just wondering if you care to put names on the 3 amigo,s.i,l get right to the point,are you talking about me?

These are my 572's built in 2009 with hyd roller, 1 7/8 primary headers after over 200 hours run time in 2 different boats. We fuel injected them last year and re-dyoed them. Carbureted they made corrected 779 HP and 720 TQ. I have seen straubs sheets with over 100 HP corrected #'s. I usually only get about 20-30 HP corrections unless there is a rain cloud in the cell and we take it to Denver. I am not saying this happened with the current 572's you are talking about but 750 HP out of a 572 happened a decade ago so thats nothing to brag about. I am currently taking away HP and adding TQ to turn bigger wheels in my Nor-tech to lower the RPM's for a 100-110 MPH cruise speed.I also have a DTS dyno with a factory speced cell that maintains a water vacuum of 1", I loses a bit of HP by causing a vacuum in the cell but it is very repeatable.

241/246 I was told 700+ hp we will find out sometime this winter I hope

I will add I had zero emgine issues since I fixed some key issues...

So about these 310cc heads...

That is a nice build Brian. My comments regarding kevins engines, were not to suggest straub/foxwell put together the most awesomeness 572. It simply is to show that its quite possible, they arent such hacks and out in left field on this stuff. I do agree 750hp from a 572 isnt setting any records, but it certainly isnt a slouch engine build either.

Thanks for sharing that you agree my engines were run on a conservative dyno

Please don't spread misinformation about my build details or dyno numbers though. I don't come on here telling people about how you called me pissed at Bob for selling you junk pistons where the coating came off, or wasting your time and money sending your heads to mamo, etc. etc. Instead I actually called Bob (while we were on good terms still) and smoothed things over between you two.

I also haven't shared how many times you have rebuilt your 99mph Baja's engine over the years, how the pistons were contacting the heads, or how your dyno numbers were all over the place. Sorry not impressed with your engine that cruises effortless at 60mph since the hull cant handle real offshore conditions. Maybe that's impressive over on calm water scream and fly but this is Offshore Only, not short speed bursts until the hull runs out. In reality your build info is interesting at best to this site for many reasons including how easy its used and how the full truth has not been shared.

No hard feelings though bud! Your welcome for all the guidance I have given you. Glad to help you find that sweet Scarab! Looking forward to running together this summer now that you can hang a little in the big water!

When it comes to my engines. They were pulled many times on the dyno with multiple variations. The numbers I share on this site are for the tune and combo actually in the boat. No reason to waste time discussing how much more power they will make with good 1 7/8ths headers(since they made MORE power on 1 7/8th CMI, 768hp 6100 735lb/ft 4700 with flame arrestors), obviously would also on big tube headers, or with the air cleaners off, etc. Pretty sure we all can agree that there are ways to make higher numbers on the dyno.

What we found is MY tractor pipes are JUNK. The flange holes were drilled wrong increasing the already bad port alignment. They have small 1 7/8th primary tubes, wrong primary lengths, to small and to short of collectors, and muffler inserts in the tips that we ended up removing.

So with MY junk tractor pipes, my air cleaners, etc. The way the engines are currently IN the boat, we made (on a conservative DPAC Dyno)

HP
751 5900
753 6000
752 6200

TQ
731 4600
732 4900
728 5000

Impressive is Straub and Foxwell planned them to peak at 6000 which they did.

But these keyboard cowboys don't have to believe my info, pics, or badass videos Kristy and I share. They are to busy pretending to be offshore powerboaters.

I welcome all to come have a great time on the water with us! Because there's not one person who has actually run a poker run or fun run with myself, Joe, Dan, or Tim that can say a bad word about our boats, engines, or camaraderie out on the lake!

Try and don't take my post out of context. You listed a bunch of car sites. This isn't one.



Man you failed basic reading. Pictures and flow numbers don't tell you anything. Just because a port looks "pretty" doesn't mean it works right. and just because it flows a ton of air doesn't mean its going to work right. No I am not a head expert, nor did I claim to be. Again, don't put words into my posts to try and prove your incorrect point.


. again you try and change the context of my post to suit your kool aid drinking. You do understand that the vast majority of motors being built are in the range of 6-700 HP right? Of course you missed (ignored) the fact that this one ran for 7 years at these speeds and yea, it dynoed at 637 HP on a dyno with a correction of .98, not some bogus 750 HP with a correction of 20%. But hey, I could have used their dyno. Would have made 764 HP.


Look up super flo. see what they say about any correction above 10%. Basic parts put together equal similar HP. when those same parts all of a sudden show up making 100HP more than anyone else has made with them, I call BS.


These clowns are on every forum that one can think of. SB posted a list a while back look at it. How many of the real marine engine builders do you see that have the time to post on 50 different forums. While you are looking, look for the failures. there are a ton.

yea a bunch of car forums. who cares. As I said before this is Offshore Only, not Drag Race only.